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Description
Flashcards by Glenn Boeckx, updated more than 1 year ago
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Created by Tanya Haywood
almost 9 years ago
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Copied by Glenn Boeckx
almost 9 years ago
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| Question | Answer |
| Whether a reaction is spontaneous is dependent on the changes in which two concepts? | entropy and enthalpy |
| Entropy is a measure of | disorder |
| Increasing entropy comes from | an increase in the amount of substance an increase in the amount of gases melt, boil or sublime a substance |
| Increasing the temperature of a system does what to the entropy? | it increases the entropy |
| if enthalpy change is positive compare the relative enthalpy of the reactants with the products | the reactants have less enthaply than the products |
| if enthaply change is positive describe what you would feel as the reaction proceeds | the system would feel colder |
| Sponaneity is favoured with what change in enthaply? | when the enthaply change is negative (exothermic reaction) |
| Describe an exothermic reaction | One where the reactants have more enthalpy than the products; the change in enthaply is negative; energy is released; the temperature of the system increases (it gets hotter) |
| spontaneous or not? Entropy increases and enthaply change is negative | always spontaneous |
| spontaneous or not? Entropy decreases and enthaply change is negative | it depends (likely to be spontaneous at low temp) |
| spontaneous or not? Entropy increases and enthaply change is positive | it depends (likely to be spontaneous at high temp) |
| spontaneous or not? Entropy decreases and enthaply change is positive | not spontaneous (ever) |
| exo or endo?? | endothermic |
| why is this endothermic? | the reactants have less enthalpy than the products heat is absorbed the enthalpy change is postive |
| which state changes are exothermic? | gas to liquid liquid to solid gas to solid |
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